Zod

Zod gives you runtime validation and compile-time types from a single schema definition, which is exactly what you want when you're tired of maintaining validators and TypeScript interfaces separately. It shines for API boundaries, form data, and environment variables where you need to guarantee shape at runtime but want full type inference. The progressive disclosure here walks you from primitives through objects, arrays, and schema composition, then gets into transforms, async validation, and error handling. The type inference section is worth hitting early since that's the whole point: write `z.object({email: z.string().email()})` once and get both validation logic and a TypeScript type. Works great with tRPC, Drizzle, and anything else where data crosses a boundary you don't fully trust.

skills.sh installs: 899
GitHub stars: 79
last updated: Aug 21, 2026

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Install

$ npx -y skills add bobmatnyc/claude-mpm-skills --skill zod --agent claude-code

Installs into .claude/skills of the current project.

Files

Zod Validation Skill

Summary

TypeScript-first schema validation library with static type inference. Define schemas once, get runtime validation and compile-time types automatically.

When to Use

Form validation with type-safe data
API request/response validation
Environment variable validation
Runtime type checking with TypeScript inference
tRPC procedure inputs/outputs
Database schema validation (Drizzle, Prisma)

Quick Start

import { z } from 'zod';

// Define schema
const UserSchema = z.object({
  id: z.string().uuid(),
  email: z.string().email(),
  age: z.number().min(18),
  role: z.enum(['user', 'admin'])
});

// Infer TypeScript type
type User = z.infer<typeof UserSchema>;

// Validate data
const result = UserSchema.safeParse(data);
if (result.success) {
  const user: User = result.data;
}

Primitive Types

Basic Types

import { z } from 'zod';

// String with validation
const nameSchema = z.string()
  .min(2, "Too short")
  .max(50, "Too long")
  .trim();

SKILL.md on GitHub

Details

Repository: github.com/bobmatnyc/claude-mpm-skills
Category: Backend & APIs
First seen: May 16, 2026

Zod